Help installing

Ok so I have everything I need and started to build my first pirate box. I am a novice to computers, and diy.
I have a raspberry pi 2, MR3040, 128g class 2 usb.

I downloaded and extracted install_piratebox.zip. and moved install file to flashdrive

I am not sure what version of OpenWrt to download, I'm not sure what version mine is or how to look it up.

[ ] openwrt-ar71xx-generic-tl-mr3040-v1-squashfs-factory.bin 05-Oct-2016 20:09 3.8M
[ ] openwrt-ar71xx-generic-tl-mr3040-v1-squashfs-factory.bin.sha256 05-Oct-2016 20:09 123
[ ] openwrt-ar71xx-generic-tl-mr3040-v2-squashfs-factory.bin 05-Oct-2016 20:09 3.8M
[ ] openwrt-ar71xx-generic-tl-mr3040-v2-squashfs-factory.bin.sha256 05-Oct-2016 20:09 123

I downloaded the v2 files
connected mr3040 to computer via ethernet. Now I upgraded firmware to [ ] openwrt-ar71xx-generic-tl-mr3040-v2-squashfs-factory.bin I was not sure if I need to use that file or [ ] openwrt-ar71xx-generic-tl-mr3040-v2-squashfs-factory.bin.sha256

no during the last stage I forgot to put USB into router, i put it in 15 minutes after I updated firmware, waited like 50 minutes. I do not know what to do now? I tried to log on to 192.168.1.1 and 192.168.0.1 and cannot connect to router, I hope I did not brick it.

so I got stuck at the download stage, it timed out as it was supposed to.

I have a question step 5, open a terminal window , what does this mean, where do I open it, on router or PC, or the rasberry pi2 I want to use?